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Dominic Thiem of Austria reacts during his group stage match against Grigor Dimitrov of Bulgaria in the ATP World Tour Finals at O2 Arena in London, Britain on Nov. 13, 2017. Dominic Thiem lost 1-2. (Xinhua/Han Yan)
Dominic Thiem of Austria reacts during his group stage match against Grigor Dimitrov of Bulgaria in the ATP World Tour Finals at O2 Arena in London, Britain on Nov. 13, 2017. Dominic Thiem lost 1-2. (Xinhua/Han Yan)